Stormy weather set steady (10)
I believe the answer is:
sweetheart
'steady' is the definition.
('sweetheart' can be a synonym of 'steady')
'stormy weather set' is the wordplay.
'stormy' is an anagram indicator.
'weather'+'set'='weatherset'
'weatherset' with letters rearranged gives 'SWEETHEART'.
(Other definitions for sweetheart that I've seen before include "Love" , "Juliet had one" , "baby" , "Darlin'"" , "flame?" .)